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Definitions

fallacy

[fal-uh-see] / ˈfæl ə si /
NOUN
illusion, misconception
Synonyms
STRONGEST
deception falsehood heresy inconsistency misinterpretation paradox untruth
STRONG
aberration ambiguity artifice bias casuistry cavil deceit deceptiveness delusion deviation elusion equivocation erratum erroneousness error evasion faultiness flaw illogicality inexactness invalidity misapprehension miscalculation misconstrual mistake notion perversion preconception prejudice quirk solecism sophism sophistry speciousness subterfuge
WEAK
non sequitur quibbling
Antonyms
STRONGEST
truth
STRONG
accuracy certainty conformity correction directness facing fairness frankness honesty meeting openness reality sameness truthfulness
WEAK
evidence fact right surety

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“This crisis is not a fallacy nor a thinly veiled threat.”

From The Wall Street Journal • Mar. 15, 2026

The sunk-cost fallacy tempts people to pay escalating premiums because they’ve paid for so long.

From MarketWatch • Nov. 15, 2025

And as long as we believe in this fallacy of separation, that’s going to continue.”

From Los Angeles Times • Aug. 4, 2025

"We know lots of children struggle. The idea that the school years are the best years of your life is a fallacy."

From BBC • May 3, 2025

Fossils, for example, and whether their existence disproved the Book of Genesis; Brother Mendel’s experiments on the sexual reproduction of the sweet pea; the fallacy of laudable pus.

From "The Evolution of Calpurnia Tate" by Jacqueline Kelly

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.